Metabolism & Nutrition, Part 1: Crash Course Anatomy & Physiology #36

What percentage of the human body is composed of water?

• 16%

• 4%

• 64%

• 1%

What is the scientific definition of metabolism?

• How fast your body burns fuel from food.

• The process of building complex molecules from simpler ones.

• Every single biochemical reaction that occurs in your body.

• The process of breaking down complex molecules into simpler ones.

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Which type of metabolic reaction involves breaking down larger molecules to release energy?

• Anabolic reactions

• Catabolic reactions

• Synthesis reactions

• Polymerization reactions

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Which of the following nutrients primarily helps the body make use of other nutrients, rather than being used as building blocks or for energy?

• Proteins

• Carbohydrates

• Vitamins

• Lipids

What happens to glucose in the body if it's not immediately needed for energy?

• It is converted into ATP and stored.

• It is stored as glycogen in the liver and muscles, or converted to fat.

• It is immediately excreted from the body.

• It is used to build new proteins.

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Which of the following is a primary function of lipids in the human body?

• Forming muscle and connective tissue.

• Insulating neurons and forming cell membranes.

• Acting as a direct source of immediate energy for all cells.

• Synthesizing essential amino acids.

Why are Omega 6 and Omega 3 fatty acids considered "essential"?

• They are the only types of fatty acids found in plants.

• The body can easily convert them into other types of fatty acids.

• They are primarily used for building muscle tissue.

• The body cannot produce them and they must be obtained through diet.

When a person eats protein, what happens to the proteins in their digestive system?

• They are directly absorbed and used as whole proteins by the body.

• They are broken down into amino acids and then reassembled into new proteins.

• They are converted into glucose for immediate energy.

• They are stored as fat for later use.